CWST

SEC source: 0000911177-24-000064 · wk-form4_1717791892.xml · nonDerivative · entry 1

HULLIGAN WILLIAM P · CIK 0001283143 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,153

F1 · shares: Represents the award of restricted stock units (RSUs) under the Casella Waste Systems, Inc. Amended and Restated 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. The RSUs will vest in full on June 6, 2025.

SEC source: 0000911177-24-000063 · wk-form4_1717791629.xml · nonDerivative · entry 1

BURKE MICHAEL K · CIK 0001224062 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,938

F1 · shares: Represents the award of restricted stock units (RSUs) under the Casella Waste Systems, Inc. Amended and Restated 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. The RSUs will vest in full on June 6, 2025.

SEC source: 0000911177-24-000061 · wk-form4_1717791532.xml · nonDerivative · entry 1

Green Emily Nagle · CIK 0001553453 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,237

F1 · shares: Represents the award of restricted stock units (RSUs) under the Casella Waste Systems, Inc. Amended and Restated 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. The RSUs will vest in full on June 6, 2025.

SEC source: 0000911177-24-000060 · wk-form4_1717791500.xml · nonDerivative · entry 1

Sova Gary · CIK 0001863220 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,196

F1 · shares: Represents the award of restricted stock units (RSUs) under the Casella Waste Systems, Inc. Amended and Restated 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. The RSUs will vest in full on June 6, 2025.

SEC source: 0000911177-24-000045 · wk-form4_1710447513.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,435

F4 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 23, 2021 and does not represent a discretionary sale by the reporting person.

F5 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.05 to $94.33. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000044 · wk-form4_1710447449.xml · nonDerivative · entry 3

Sayward Shelley E. · CIK 0001823513 · SENIOR VP & GENERAL COUNSEL

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 19,287

F4 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 4, 2021 and does not represent a discretionary sale by the reporting person.

F5 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $93.81 to $93.92. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000043 · wk-form4_1710447411.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 34,238

F4 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 23, 2021 and does not represent a discretionary sale by the reporting person.

F5 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $93.79 to $94.17. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000042 · wk-form4_1710447358.xml · nonDerivative · entry 3

Ligon Paul · CIK 0001926747 · SR VP of Sustainable Growth

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,815

F3 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 9, 2021 and does not represent a discretionary sale by the reporting person.

F4 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $93.78 to $93.80. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000040 · wk-form4_1710447295.xml · nonDerivative · entry 3

Steves Sean · CIK 0001929869 · Sr VP & COO of SW Ops

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,220

F4 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 9, 2021 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-24-000039 · wk-form4_1710447271.xml · nonDerivative · entry 3

Coletta Edmond · CIK 0001564279 · PRESIDENT

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 170,034

F4 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 5, 2021 and does not represent a discretionary sale by the reporting person.

F5 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $93.97 to $94.03. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000045 · wk-form4_1710447513.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,826

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 25, 2022 and August 30, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.06 to $94.11. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000044 · wk-form4_1710447449.xml · nonDerivative · entry 2

Sayward Shelley E. · CIK 0001823513 · SENIOR VP & GENERAL COUNSEL

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 19,411

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 12, 2022 and August 2, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.26 to $94.33. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000043 · wk-form4_1710447411.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 35,189

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 12, 2022 and August 22, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.09 to $94.33. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000042 · wk-form4_1710447358.xml · nonDerivative · entry 2

Ligon Paul · CIK 0001926747 · SR VP of Sustainable Growth

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,919

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 18, 2022 and August 2, 2023 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-24-000041 · wk-form4_1710447325.xml · nonDerivative · entry 2

Drohan Kevin · CIK 0001917955 · VP & CHIEF ACCOUNTING OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 3,109

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 19, 2022 and August 2, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.23 to $94.28. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000040 · wk-form4_1710447295.xml · nonDerivative · entry 2

Steves Sean · CIK 0001929869 · Sr VP & COO of SW Ops

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,264

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 16, 2022 and August 2, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.30 to $94.44. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000039 · wk-form4_1710447271.xml · nonDerivative · entry 2

Coletta Edmond · CIK 0001564279 · PRESIDENT

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 170,486

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 12, 2022 and August 2, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.27 to $94.36. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000045 · wk-form4_1710447513.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 136,500

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000044 · wk-form4_1710447449.xml · nonDerivative · entry 1

Sayward Shelley E. · CIK 0001823513 · SENIOR VP & GENERAL COUNSEL

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 19,782

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000043 · wk-form4_1710447411.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,862

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000042 · wk-form4_1710447358.xml · nonDerivative · entry 1

Ligon Paul · CIK 0001926747 · SR VP of Sustainable Growth

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 23,083

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000041 · wk-form4_1710447325.xml · nonDerivative · entry 1

Drohan Kevin · CIK 0001917955 · VP & CHIEF ACCOUNTING OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 3,282

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000040 · wk-form4_1710447295.xml · nonDerivative · entry 1

Steves Sean · CIK 0001929869 · Sr VP & COO of SW Ops

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,488

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000039 · wk-form4_1710447271.xml · nonDerivative · entry 1

Coletta Edmond · CIK 0001564279 · PRESIDENT

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 171,219

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000038 · wk-form4_1710447241.xml · nonDerivative · entry 1

Helgeson Bradford John · CIK 0001593745 · Executive VP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,745

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000021 · wk-form4_1709242410.xml · nonDerivative · entry 2

Sayward Shelley E. · CIK 0001823513 · SENIOR VP & GENERAL COUNSEL

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,584

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 12, 2021. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 4, 2021 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $89.53 to $90.40. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000020 · wk-form4_1709242341.xml · nonDerivative · entry 2

Steves Sean · CIK 0001929869 · Sr VP & COO of SW Ops

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,609

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 12, 2021. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 9, 2021 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $89.32 to $89.41. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000019 · wk-form4_1709242297.xml · nonDerivative · entry 2

Ligon Paul · CIK 0001926747 · SR VP of Sustainable Growth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,550

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 12, 2021. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 9, 2021 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $89.00 to $89.18. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000023 · wk-form4_1709242503.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,802

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 12, 2021. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 23, 2021 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $90.09 to $90.88. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000022 · wk-form4_1709242452.xml · nonDerivative · entry 2

Coletta Edmond · CIK 0001564279 · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 168,556

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 12, 2021. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 5, 2021 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $90.18 to $90.37. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000023 · wk-form4_1709242503.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,102

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 12, 2021, as a result of the level of achievement by the issuer of certain performance objectives during the period running from January 1, 2023 through December 31, 2023, and a multiplier based on relative total shareholder return for the period running from January 1, 2021 to December 31, 2023, as certified by the issuer's compensation and human capital committee on February 27, 2024.

SEC source: 0000911177-24-000022 · wk-form4_1709242452.xml · nonDerivative · entry 1

Coletta Edmond · CIK 0001564279 · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 176,827

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 12, 2021, as a result of the level of achievement by the issuer of certain performance objectives during the period running from January 1, 2023 through December 31, 2023, and a multiplier based on relative total shareholder return for the period running from January 1, 2021 to December 31, 2023, as certified by the issuer's compensation and human capital committee on February 27, 2024.

SEC source: 0000911177-24-000021 · wk-form4_1709242410.xml · nonDerivative · entry 1

Sayward Shelley E. · CIK 0001823513 · SENIOR VP & GENERAL COUNSEL

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,246

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 12, 2021, as a result of the level of achievement by the issuer of certain performance objectives during the period running from January 1, 2023 through December 31, 2023, and a multiplier based on relative total shareholder return for the period running from January 1, 2021 to December 31, 2023, as certified by the issuer's compensation and human capital committee on February 27, 2024.

SEC source: 0000911177-24-000020 · wk-form4_1709242341.xml · nonDerivative · entry 1

Steves Sean · CIK 0001929869 · Sr VP & COO of SW Ops

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,967

F1 · acquired: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 12, 2021, as a result of the level of achievement by the issuer of certain performance objectives during the period running from January 1, 2023 through December 31, 2023, and a multiplier based on relative total shareholder return for the period running from January 1, 2021 to December 31, 2023, as certified by the issuer's compensation and human capital committee on February 27, 2024.

SEC source: 0000911177-24-000019 · wk-form4_1709242297.xml · nonDerivative · entry 1

Ligon Paul · CIK 0001926747 · SR VP of Sustainable Growth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,155

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 12, 2021, as a result of the level of achievement by the issuer of certain performance objectives during the period running from January 1, 2023 through December 31, 2023, and a multiplier based on relative total shareholder return for the period running from January 1, 2021 to December 31, 2023, as certified by the issuer's compensation and human capital committee on February 27, 2024.

SEC source: 0000911177-23-000154 · wk-form4_1702589186.xml · nonDerivative · entry 1

Ligon Paul · CIK 0001926747 · SR VP of Sustainable Growth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,454

F1 · shares: Represents a gift of 50 shares to Goodwill Industries of Northern New England and 50 shares to the University of Vermont.

SEC source: 0000911177-23-000152 · wk-form4_1700687376.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT 2

Disclosed balance after: 137,000

F1 · shares: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT 2") for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

F3 · ownership.nature: Held by the SLAT 2 for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

SEC source: 0000911177-23-000152 · wk-form4_1700687376.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 57,100

F1 · shares: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT 2") for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

F2 · ownership.nature: Held by Mr. Casella's spouse. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0000911177-23-000150 · wk-form4_1699479518.xml · derivative · entry 2

Helgeson Bradford John · CIK 0001593745 · Executive VP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,500

Underlying: Class A Common Stock · 17,500 shares

Expires 2033-11-05

F2 · derivative.exercise_date: This option shall become exercisable with respect to one-fifth of the shares on November 6, 2024, and shall become exercisable as to an additional one-fifth of the shares on each of the second, third, fourth, and fifth anniversaries of the grant date.

SEC source: 0000911177-23-000150 · wk-form4_1699479518.xml · nonDerivative · entry 1

Helgeson Bradford John · CIK 0001593745 · Executive VP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,881

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on November 6, 2024.

SEC source: 0000911177-25-000002 · wk-form4_1736542367.xml · nonDerivative · entry 1

Green Emily Nagle · CIK 0001553453 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,624

F1 · shares: Represents a gift of shares from a living trust, which shares were previously reported as directly owned by the reporting person, to the Jack Calvin Green Unelected Trust. The reporting person is a trustee and a beneficiary of the Jack Calvin Green Unelected Trust.

SEC source: 0000911177-23-000136 · wk-form4_1696369485.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT

Disclosed balance after: 131,000

F1 · shares: Represents a gift of shares to a Spousal Lifetime Access Trust ("SLAT") for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT.

F2 · ownership.nature: Held by the SLAT for the benefit of Mr. Casella's spouse SLAT. Mr. Casella's spouse is the trustee of the SLAT. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0000911177-23-000136 · wk-form4_1696369485.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,000

F1 · shares: Represents a gift of shares to a Spousal Lifetime Access Trust ("SLAT") for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT.

SEC source: 0000911177-23-000134 · wk-form4_1693951325.xml · nonDerivative · entry 1

Drohan Kevin · CIK 0001917955 · VP & CHIEF ACCOUNTING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,749

F1 · shares: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 31, 2021 and does not represent a discretionary sale by the reporting person.

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $78.22 to $78.57. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-23-000128 · wk-form4_1692909163.xml · nonDerivative · entry 1

Coletta Edmond · CIK 0001564279 · PRESIDENT & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,424

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $81.63 to $81.70. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-23-000120 · wk-form4_1692303796.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 194,100

F1 · shares: Represents a gift of shares to Mr. Casella's spouse.

F2 · ownership.nature: Held by Mr. Casella's spouse. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0000911177-23-000120 · wk-form4_1692303796.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300,000

F1 · shares: Represents a gift of shares to Mr. Casella's spouse.

SEC source: 0000911177-23-000118 · wk-form4_1691784930.xml · nonDerivative · entry 1

Ligon Paul · CIK 0001926747 · SR VP of Sustainable Growth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,554

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $78.76 to $78.79. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-23-000117 · wk-form4_1691784349.xml · nonDerivative · entry 1

HULLIGAN WILLIAM P · CIK 0001283143 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,702

SEC source: 0000911177-23-000113 · wk-form4_1691698457.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,742

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $80.00 to $80.53. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.